Tack pulling machine



May 14, 1946. G. A. MINER- TAGK PULLING MACHINE Filed Sept 7 44 George 1 m Patented May 14, 1946 UNITED STATES PATE I OFFICE TACK PULLING MACHINE k George A. Mine'r,-' Manchesten N. Hi, assigiior' to United Shoe, Machinery Corporation, Fle'ming-. ton, N. 'J.', acorporation of New Jersey Application September 7, 194g, SerialNo. 552,97 7 Claims. (CI; 12-16) This invention relates to tack pulling,ma-, chines, and is herein illustrated as. embodied in a machine for pulling insole tacks from shoesl' In the past, considerable difiiculty hasfbeen experienced in pulling insole tacks from shoes. by reason of the fact that the tacks are often deeply embedded in the insole with the headof thetack below the outer. surface of the sole. In attempt} ing to force a tool beneath the head ofa' tack, in order to position the tool for the pulling operation, it frequently happens that the material of the insole is mutilated, or the headof the tack is knocked off, further contributing to the difiiculty of removing the tack. Furthermore, in tack pulling machines as'heretofore constructed difficulty has been experienced in constructing the pulling mechanism in such-manner that the operating point is readily visible for locating tacks relatively to the tool without subjecting the operator to likelihood of injuryfrom flying tacks. In view of the foregoing, it is an object of the present invention to provide an improved ta'ck pulling machine which will eliminate the difii culties above enumerated. A y H To this end and as shown, the invention-pro vides in a, machine of the type refer-red to a tool having an attenuated edge portion for. entering between the underside of the tack head and the shoe, together with means for imparting movements of translation and rotation to the tool .the lasted shoe l4 moperati-ve. position relatively toa rotary'tack pulling tool 20."

,The tool comprisesla shank 22 terminating in a taperedendportion ZLthere being a flute 26 extending spirallyialong the periphery of the tool. The end of the tool is beveled outwardlyof the flute to form with it a wedge-shaped portion terminating in .a thin edge 28, which can readily enter between the head of a tack l0 and the material of the insole l2." T The work rest l8 is in the form of a tube, the upper and lower outer end portions of which are cut away to formopenings 3 0 and 32. The outer end wall of the tube along the opening 30 provides a rest or support for engaging the bottom of the shoe, and is preferably inclined to the axis of the tube in a plane extending at approximately the same angle to'thej axis as does a tangent to the edge portions 28 of the tool. The upper opening 32 is for the purpose of permitting the passage of pulled tacks out of the machine. The inner portion of the tube is located ina supporting sleeve 36. The work rest is adjustable angularlyabout its axis ands secured in adjusted position bya set screw 38 in the sleeve 36 arranged to engage the bottom of a groove 40 in the outer surface of the inner portion-34 of the work rest.

for the purpose of ensuring entry of the toolzbe-l neath the tack head and for removing thestack; from the work. Preferably and as shown, the machine comprises a tubular work rest adjacent to the tool by which the shoe to be operated upon may be located in operative position relatively to the tool, and also operable after the tack is pulled to direct the tack to one side, thereby preventing likelihood of injury to the operator.

These and other features of the invention are disclosed in the following specification and in the accompanying drawing, and are pointed out in the claims.

In the drawing,

Fig. 1 is a side elevation, partly in section, of the tack pulling machine with work in operative relation thereto; and

Fig. 2 is a perspective view, partly in section, looking along the arrow II of Fig. 1.

The machine shown in the drawing is a tack pulling machine for use in pulling insole tacks, such as tacks l0, which secure an insole l2 of a shoe M to the bottom of a last IS. The machine preferably comprises a work rest I8 for locating The tool is rotated by means of an electric motor 42- and is connected to a shaft 44 of the motor by a coupling-block arranged to be received m a transverse slot 48 in the end of the shaft. This construction permits longitudinal movement ofthe tool withoutinterfering with its rotary movement' under the action of 'the shaft M. In order to move the tool back and forth relatively to the support, there is provided a cam 50 surrounding the shaft and rotatabiy mounted in the sleeve 36, the cam having a recess 5| in which the shank of the tool is fixedly secured. The cam has a cam groove 52, in which is located a roller 54 on a stationary pin 56. The construction is such that, as the shaft 56 rotates, the too1 and the cam will be rotated with it, but as rotation occurs the roller 54 will cause an oscillating movement of the cam and the tool along the axis of the shaft, such that the tool moves back and forth across the outer edge of the work rest. Thus, the tool, as it is rotated, is moved beyond the work rest and is pressed into the insole material of a shoe held against the rest to penetrate the material below the head of the tack. The timing f the cam 50 is such that the forward edge of the tool will be located slightly beyond the plane of the lower edge of the work rest when the position of the parts is that illustrated in Fig. 1.

The angular location of the tool edge, when in its outermost position, can be adjusted by rotating the sleeve 36 and the roller 54 about the axis of the sleeve and then clamping the sleeve in fixed position against the motor housing by means of aplate 58 and bolts 60. Since the roller 54 controls the operation of the cam 50, this ad-. J'ustment makes it possible to vary the effective stroke of the tool relatively to the work rest If! in any of its adjusted positions. By shifting the work rest l8 and roller 54, the mechanism can readily be adapted to pull tacks from a shoe presented to the tool at an angle convenient to the operator.

In the operation of the machine, a shoe is presented to the work rest l8 with the insole inengagement therewith, and the shoe is moved along the support to present a tack to be pulled in alinement with the tool. As the tool rotates, itsv thin edge portion 28 sweeps across'the face of the insole and at the same time is pressed, into it to engage the tack beneath the head thereof. Subsequent rotation and withdrawal of the tool serves to pull the tack from the work. After the tack has been pulled, further rotation of the tool forces the tack upwardly along the inner wall of the support until it reaches the opening 32 of the work support, where the tack is thrown out of the machine by centrifugal force in a direction extending to one side of the operator. Thus, any likelihood of injury to the operator by flying tacks is eliminated.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A tack pulling machine comprising a cylindrical tool having a fluted portion terminating in a thin edge extending at an inclination to the axis of the tool, a tubular work support surrounding the end of the tool and having a beveled work-engaging portion extending substantially parallel to said edge, means for rotating the tool, and means for oscillating the tool axially of the work support.

2. A tack pulling machine comprising a frame, a bearing in the frame, a sleeve rotatably mounted in the bearing, a tack pulling tool carried by the sleeve and. comprising a fluted portion terminating in a thin edge portion extending at an angle to the axis of the sleeve, a tubular Work support surrounding the tool and having a beveled workengaging portion extending in a plane substantially parallel to the edge of the tool, means for rotating the sleeve, and a cam for moving the sleeve and tool back and forth relatively to the work support.

3. A tack pulling machine comprising a tube, the outer end of which is beveled to form a workengaging portion, a tack pulling tool positioned axially of the tube and having a thin edge portion, means for rotating the tool, and means for oscillating the tool back and forth axially of the tube to cause the edge of the tool to project beyond the work-engaging portion of the tube.

4. A tack pulling machine comprising a tubular work rest having a beveled work-engaging end portion, a tool normally located within the work rest and having a thin edge, means for rotating the tool, and means for oscillating the tool during its rotation from a position in which the thin edge of the tool is within the work rest to a position in which the thin edge is beyond the work-engaging portion of the work rest.

5. A tack pulling machine comprising a work rest in the form of a tube having a beveled workengaging end portion, a pulling tool positioned within the tube and having a thin edge extending adjacent to the work-engaging portion of the tube, means for rotating the tool, and means operable during rotation of the tool for oscillating the tool axially of the tube, said tube having an opening spaced from the work-engaging portion to provide a discharge passage for tacks pulled by the tool;

6. A tack pulling machine comprising a tubular work rest having an end portion which is beveled to provide a work-engaging portion, a tack pulling tool mounted for rotation within the tube and having, a thin edge portion projecting adjacent to the work-engaging portion of the work rest, and means for oscillating the tool back and forth past the work-engaging portion of the work rest.

'7. A tack pulling machine comprising a tube having a beveled end portion constituting a work rest, a tool rotatably and slidably mounted within the tube and having a thin edge portion disposed adjacent to the work rest, a discharge opening located in the tube in spaced relation to the work rest, means for rotating the tool, and means operable during rotation of the tool for oscillating the tool back and forth past the work rest to pull a tack from the work and to move the tack toward the discharge opening.

GEORGE A. MINER. 

